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Tiafoe topples del Potro at ATP Delray Beach

Frances Tiafoe of the US toppled second-seeded Juan Martin del Potro, 7-6 (8/6), 4-6, 7-5, to reach the quarter-finals of the ATP tournament at Delray Beach, Florida, on February 22, 2018AFP/File

Frances Tiafoe turned the tables on Juan Martin del Potro on Thursday, toppling the second-seeded former champion 7-6 (8/6), 4-6, 7-5 to reach the quarter-finals of the ATP tournament at Delray Beach, Florida.

The 20-year-old American needed four match points to finish off Argentina's del Potro, the latest seed to fall in a tournament that saw top seed and defending champion Jack Sock, sixth-seeded John Isner and ninth-seeded Milos Raonic beaten on Wednesday.

"There were a lot of times in the match where I was down and he had break points, and it could have really gone either way, and I came up in those moments in the match and that really made the difference," Fritz said.